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PLATE III.

COLOUR      TEMP. F,

USE,

S3
 > »
	CHERRY RED
	:   1650°
 !
	For Preliminary hardening only

H (L, O
 rn
	PALE BLUE
	600°
	Too soft for anything

o
	DARK BLUE
	570°
	Springs Screw drivers Circular saws for Metal Cold chisels for W.I Firmer chisels

H— (
 h
	DARK PURPLE
	550°
	"   •       •  ••"•      "             ........ """•   •• " Cold chisels for CL Axes and adzes Cold chisels for Steel

<
	LIGHT PURPLE
	530°
	Augers

H
	YELLOW PURPLE
	520°
	Flat Drills for Brass Twist Drills Plane Irons

-----
	BROWN YELLOW
	500°
	Gouges Reamers Punches and Dies


	VERY DARK STRAW
	490°
	Cha-sers Taps Screw-cutting Dies

£
	MEDIUM STRAW
	470°
	Boring cutters

<^ X
	LIGHT STRAW
	450°
	Milling cutters Drills Iron-planing tools


	VERY PALE STRAW
	,30-
	Steel- planing tools Hammer faces Light turning tools Scrapers for Brass

Fig. J.lf7b.—Tem,pe'rin,ff Table.

Face p. 126.